Four categories of people are enumerated as compared to a thunderhead;
1. Those who thunder but who give no rain (those who know the Buddhist scriptures
but who don't know the Four Noble Truths);
2. Those who give rain but who don't thunder (those who don't know the Buddhist scriptures
but who know the Four Noble Truths);
3. Those who give neither thunder nor rain (those who know neither the Buddhist scriptures
nor the Four Noble Truths), and;
4. Those who both thunder and give rain (those who know both the Buddhist scriptures
and the Four Noble Truths).